<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item><a href="/">商品管理</a></el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert
        :closable="false"
        show-icon=""
        title="注意：只允许为第三级分类设置相关参数"
        type="warning"
      >
      </el-alert>
      <!-- 选择商品分类区域 -->
      <el-row>
        <el-col class="selectOpt">
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择器 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="cateList"
            :props="Cateprops"
            @change="handleChange"
            expandTrigger="hover"
          ></el-cascader>
        </el-col>
      </el-row>
      <!-- tab标签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 动态参数页面 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addParambtnClick"
            >添加参数</el-button
          >
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag
                  v-for="(item, index) in scope.row.attr_vals"
                  :key="index"
                  closable
                  @close="handleClosed(index,scope.row)"
                >
                  {{ item }}
                </el-tag>
                       <!-- 输入的文本框 -->
              <el-input
                class="input-new-tag"
                v-if="scope.row.inputVisible"
                v-model="scope.row.inputValue"
                ref="saveTagInput"
                size="small"
                @keyup.enter.native="handleInputConfirm(scope.row)"
                @blur="handleInputConfirm(scope.row)"
              >
              </el-input>
              <el-button
                v-else
                class="button-new-tag"
                size="small"
                @click="showInput(scope.row)"
                >+ New Tag</el-button
              >
              </template>
       
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column
              label="参数名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  size="mini"
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  size="mini"
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 静态属性页面 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button
            type="warning"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addParambtnClick"
            >添加属性</el-button
          >
          <!-- 静态属性数据 -->
          <el-table :data="onlyTableDate" border stripe>
              <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag
                  v-for="(item, index) in scope.row.attr_vals"
                  :key="index"
                  closable
                  @close="handleClosed(index,scope.row)"
                >
                  {{ item }}
                </el-tag>
                       <!-- 输入的文本框 -->
              <el-input
                class="input-new-tag"
                v-if="scope.row.inputVisible"
                v-model="scope.row.inputValue"
                ref="saveTagInput"
                size="small"
                @keyup.enter.native="handleInputConfirm(scope.row)"
                @blur="handleInputConfirm(scope.row)"
              >
              </el-input>
              <el-button
                v-else
                class="button-new-tag"
                size="small"
                @click="showInput(scope.row)"
                >+ New Tag</el-button
              >
              </template>
       
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column
              label="属性名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  size="mini"
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  size="mini"
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <!-- 参数表单 -->
      <el-form
        :model="addForm"
        :rules="addFormrules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 编辑参数的对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <!-- 参数表单 -->
      <el-form
        :model="editForm"
        :rules="editFormrules"
        ref="editFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: "Params",
  data() {
    return {
      // 商品分类列表
      cateList: [],
      // 级联选择框的配置对象
      Cateprops: {
        value: "cat_id",
        label: "cat_name",
        children: "children",
      },
      // 级联选择器双向绑定到的数组
      selectedCateKeys: [],
      // 被激活的页签的名称
      activeName: "many",
      // 动态参数数据
      manyTableData: [],
      // 静态属性数据
      onlyTableDate: [],
      // 添加参数的对话框显示与否
      addDialogVisible: false,
      // 添加表单的数据对象
      addForm: {
        attr_name: "",
      },
      // 添加表单的验证规则对象
      addFormrules: {
        attr_name: [
          {
            required: true,
            message: "请输入参数名称",
            trigger: "blur",
          },
        ],
      },
      // 修改参数对话框的展示与否
      editDialogVisible: false,
      // 修改表单的数据对象
      editForm: {},
      // 编辑表单的验证规则对象
      editFormrules: {
        attr_name: [
          {
            required: true,
            message: "请输入参数名称",
            trigger: "blur",
          },
        ],
      },
    };
  },
  created() {
    // 获取所有的商品分类列表
    this.getCateList();
  },
  computed: {
    // 分类参数中添加按钮是否禁用
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true;
      }
      return false;
    },
    // 当前选中的三级分类的id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2];
      }
      return null;
    },
    // 动态计算标题的文本
    titleText() {
      if (this.activeName === "many") {
        return "动态参数";
      }
      return "静态属性";
    },
  },
  methods: {
    // 获取所有的商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类失败");
      }
      this.cateList = res.data;
    },
    // 级联选择框选中框变化会触发
    handleChange() {
      this.getParamsData();
    },
    // tab 页签点击事件的处理函数
    handleTabClick() {
      console.log(this.activeName);
      this.getParamsData();
    },
    async getParamsData() {
      // 如果不是三级分类则将 selectedCateKeys 清空
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = [];
        return;
      }
      // 是三级分类
      // console.log(this.selectedCateKeys);
      // 获取动态参数和静态属性
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        {
          params: { sel: this.activeName },
        }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("获取参数列表失败");
      }
      res.data.forEach((item) => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(" ") : [];
        // 控制文本框的显示与隐藏
        item.inputVisible = false;
        // 文本框中输入的值
        item.inputValue = ''
      });
      console.log(res.data);
      if (this.activeName === "many") {
        this.manyTableData = res.data;
      } else {
        this.onlyTableDate = res.data;
      }
    },
    // 添加参数按钮的点击事件
    addParambtnClick() {
      this.addDialogVisible = true;
    },
    // 添加参数对话框关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields();
    },
    // 点击确定按钮，添加参数
    addParams() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) return;
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName,
          }
        );
        if (res.meta.status !== 201) {
          return this.$message.error("添加参数失败");
        }
        this.$message.success("添加参数成功");
        this.addDialogVisible = false;
        this.getParamsData();
      });
    },
    // 编辑参数对话框关闭事件
    editDialogClosed() {
      this.$refs.editFormRef.resetFields();
    },
    // 点击确定按钮，编辑参数
    editParams() {
      this.$refs.editFormRef.validate(async (valid) => {
        if (!valid) return;
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName,
          }
        );
        if (res.meta.status !== 200) {
          return this.$message.error("修改参数失败");
        }
        this.$message.success("修改参数成功");
        this.editDialogVisible = false;
        this.getParamsData();
      });
    },
    // 编辑参数对话框的显示与否
    async showEditDialog(attr_id) {
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attr_id}`,
        {
          params: { attr_sel: this.activeName },
        }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("获取参数信息失败");
      }
      this.editForm = res.data;
      this.editDialogVisible = true;
    },
    // 删除参数
    async removeParams(attr_id) {
      const confirmRes = await this.$confirm(
        "此操作将永久删除该参数, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning",
        }
      ).catch((err) => err);
      if (confirmRes !== "confirm") {
        return this.$message.info("已取消删除");
      }
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${attr_id}`
      );
      if (res.meta.status !== 200) {
        return this.$message.error("修改参数失败");
      }
      this.$message.success("删除参数成功");
      this.getParamsData();
    },
    // 文本框失去焦点或按下了enter 都会触发
    async handleInputConfirm(row) {
      if(row.inputValue.trim().length === 0) {
        row.inputValue = '';
        row.inputVisible = false;
        return
      }
      // 若输入为内容
      row.attr_vals.push(row.inputValue.trim());
      row.inputValue = '';
      row.inputVisible = false;
      // 需要发起请求，保存数据到后台
      this.saveAttrvals(row)
    },
    // 保存修改的vals
    async saveAttrvals(row) {
       const { data:res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
        attr_name:row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if(res.meta.status !== 200) {
        return this.$message.error('修改参数失败')
      }
      this.$message.success('修改参数成功')
    },
    // 点击按钮，显示文本输入框
    showInput(row) {
      row.inputVisible = true;
      // 让文本框自动获得焦点
      // $nextTick 方法的作用，当页面上元素被重新渲染之后才会执行回调函数中的代码
      this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
    },
    // 删除参数
    handleClosed(index,row) {
      row.attr_vals.splice(index,1);
      this.saveAttrvals(row)
    }
  },
};
</script>

<style scoped>
.selectOpt {
  margin: 15px 0;
  font-size: 14px;
}
.el-tag {
  margin: 8px;
}
.input-new-tag {
  width: 120px;
}
</style>